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Timezone detection: Client implementation
refs #6078
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(function(Icinga, $) { | ||
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'use strict'; | ||
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/** | ||
* Get the maximum timezone offset | ||
* | ||
* @returns {Number} | ||
*/ | ||
Date.prototype.getStdTimezoneOffset = function() { | ||
if (Date.maxTimezoneOffset !== undefined) { | ||
return Date.maxTimezoneOffset; | ||
} | ||
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var year = new Date().getYear(); | ||
var previousOffset; | ||
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for (var i=0; i<12; i++) { | ||
var d = new Date(year, i, 1); | ||
if (previousOffset !== undefined) { | ||
previousOffset = Math.max(previousOffset, d.getTimezoneOffset()); | ||
} else { | ||
previousOffset = d.getTimezoneOffset(); | ||
} | ||
} | ||
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Date.maxTimezoneOffset = previousOffset; | ||
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return Date.maxTimezoneOffset; | ||
}; | ||
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/** | ||
* Test for daylight saving time zone | ||
* | ||
* @returns {boolean} | ||
*/ | ||
Date.prototype.isDst = function() { | ||
return (this.getStdTimezoneOffset() === this.getTimezoneOffset()) ? false : true; | ||
}; | ||
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/** | ||
* Write timezone information into a cookie | ||
* | ||
* @constructor | ||
*/ | ||
Icinga.Timezone = function() { | ||
this.cookieName = 'icingaweb2-tzo'; | ||
}; | ||
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Icinga.Timezone.prototype = { | ||
/** | ||
* Initialize interface method | ||
*/ | ||
initialize: function () { | ||
this.writeTimezone(); | ||
}, | ||
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destroy: function() { | ||
// PASS | ||
}, | ||
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/** | ||
* Write timezone information into cookie | ||
*/ | ||
writeTimezone: function() { | ||
var date = new Date(); | ||
var timezoneOffset = (date.getTimezoneOffset()*60) * -1; | ||
var dst = date.isDst(); | ||
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if (this.readCookie(this.cookieName)) { | ||
return; | ||
} | ||
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this.writeCookie(this.cookieName, timezoneOffset + ',' + dst); | ||
}, | ||
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/** | ||
* Write cookie data | ||
* | ||
* @param {String} name | ||
* @param {String} value | ||
* @param {Number} days | ||
*/ | ||
writeCookie: function(name, value, days) { | ||
var expires = ''; | ||
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if (days) { | ||
var date = new Date(); | ||
date.setTime(date.getTime()+(days*24*60*60*1000)); | ||
var expires = '; expires=' + date.toGMTString(); | ||
} | ||
document.cookie = name + '=' + value + expires + '; path=/'; | ||
}, | ||
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/** | ||
* Read cookie data | ||
* | ||
* @param {String} name | ||
* @returns {*} | ||
*/ | ||
readCookie: function(name) { | ||
var nameEq = name + '='; | ||
var ca = document.cookie.split(';'); | ||
for(var i=0;i < ca.length;i++) { | ||
var c = ca[i]; | ||
while (c.charAt(0)==' ') { | ||
c = c.substring(1,c.length); | ||
} | ||
if (c.indexOf(nameEq) == 0) { | ||
return c.substring(nameEq.length,c.length); | ||
} | ||
} | ||
return null; | ||
} | ||
}; | ||
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})(Icinga, jQuery); |